Longitudinal Z-boson polarization and the Higgs boson production cross section at the Large Hadron Collider
Longitudinal Z-boson polarization and the Higgs boson production cross section at the Large Hadron Collider
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DOI：
10.1016/j.physletb.2021.136613
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发表时间：
2020-12
影响因子：
4.4
通讯作者：
S. Amoroso;J. Fiaschi;F. Giuli;A. Glazov;F. Hautmann;O. Zenaiev
中科院分区：
文献类型：
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作者：
S. Amoroso;J. Fiaschi;F. Giuli;A. Glazov;F. Hautmann;O. Zenaiev
带电轻子对通过电弱规范玻色子交换在高能强子碰撞中大量产生，是大型强子对撞机（LHC）中质子-质子碰撞中最精确测量的最终状态之一。我们提出轻子角分布的测量可以用来提高对大型强子对撞机希格斯玻色子产生截面的理论预测的准确性。为此，我们利用与纵向z -玻色子极化相关的轻子角系数对从入射质子中分解出来的胶子的部分密度函数（PDF）的敏感性，以约束希格斯玻色子的横截面在胶子聚变过程中的作用。通过使用开源平台fitter进行详细的数值分析，我们发现LHC Run III和高亮度HL-LHC的纵向极化角系数的高统计量测定在大范围的希格斯玻色子速度范围内将希格斯玻色子截面预测的PDF系统不确定性提高了50%。
Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC). We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC. To this end, we exploit the sensitivity of the lepton angular coefficient associated with the longitudinalZ-boson polarization to the parton density function (PDF) for gluons resolved from the incoming protons, in order to constrain the Higgs boson cross section from gluon fusion processes. By a detailed numerical analysis using the open-source platformxFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.